Silverlight之鼠标拖放物体

最新推荐文章于 2016-01-25 17:36:31 发布

zhouminjob120

最新推荐文章于 2016-01-25 17:36:31 发布

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分类专栏： Silverlight

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本文介绍了一个使用WPF实现的简单拖拽功能示例。通过XAML和C#代码，展示了如何使WPF界面中的Grid元素响应鼠标操作，实现平滑拖动效果。

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Drag.xaml

<Canvas>
        <Grid Width="300" Height="60" Background="GreenYellow" MouseMove="Grid_MouseMove" MouseLeftButtonDown="Grid_MouseLeftButtonDown" MouseLeftButtonUp="Grid_MouseLeftButtonUp">
        </Grid>
</Canvas>

Drag.xaml.cs

        Point currentPoint;
        bool mouseMoving = false;
        private void Grid_MouseMove(object sender, MouseEventArgs e)
        {
            FrameworkElement element = sender as FrameworkElement;
            if (mouseMoving)
            {
                double cX = e.GetPosition(null).X - currentPoint.X;
                double cY = e.GetPosition(null).Y - currentPoint.Y;
                element.SetValue(Canvas.TopProperty, cY + (double)element.GetValue(Canvas.TopProperty));
                element.SetValue(Canvas.LeftProperty, cX + (double)element.GetValue(Canvas.LeftProperty));
                currentPoint = e.GetPosition(null);
            }
        }

        private void Grid_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            FrameworkElement element = sender as FrameworkElement;
            currentPoint = e.GetPosition(null);
            mouseMoving = true;
            if (element != null)
            {
                element.CaptureMouse();
                element.Cursor = Cursors.Hand;
            }
        }

        private void Grid_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            FrameworkElement element = sender as FrameworkElement;
            mouseMoving = false;
            element.CaptureMouse();
            currentPoint.X = 0;
            currentPoint.Y = 0;
            element.Cursor = null;
        }